Homelite weedeater won't start. Out of ideas.

Brief history: It was my dads and used to run fine except for some problems getting fuel. I found the fuel lines were bad and the little filter end was just rolling around in the tank. So i replaced the line and the bulb fills up no problem.

Now it just wont start at all. I took it all apart last night; exhaust is clear, cleaned a lot of black grime off the cylinder head, took apart the carb and mostly visually inspected it everything looked fine diaphragm still moved, screens were clear, compression seems great.
I put fuel directly into the motor and still no start, not even a sputter and die. I pulled the spark plug out, grounded it, and cranked it. Looks like a nice spark appears but I don't know much about plugs. I've tried the 2 stroke mixture gas, I've put un-mixed 87 in the tank, no results.

I don't know what else to do and my arm is getting sore!

Oh also i don't know where the trims should be set. I've tightened them all the way to the right then went left 2 full turns on each and tried. I heard from somewhere that's a good place to start.

Homelite weedeater won't start. Out of ideas.

No i haven't used a gauge, just going by the difference in feel with the spark plug out and with it back in when pulling the starter. I guess i can get a gauge setup and test it.
I guess the main issue to look at is it doesn't fire even when i put gas directly into the cylinder.

Homelite weedeater won't start. Out of ideas.

IT'S ALIVEEEEEEEEEEEEEEEEEE!
I put a new spark plug in and about 50 cranks later and some trim fiddling it fired up. I guess I learned that all sparks are not created equal. Like Yoyizit said "Having a spark jump under compression requires a higher voltage." Makes sense to me now. Either way taking it all apart was a good time, and it run really strong now.